whoever's behind them, they've shown that india's largest city is still vulnerable. caroline hawley, bbc news. >>> the president and congressional negotiators return to the debt negotiations table today after yesterday's meeting ended in confrontation. those in the meeting said that president obama announced enough is enough, we have to be willing to compromise, before walking out of the room. the moody's rating service is threatening to downgrade the nation's credit rating because of this crisis. >> both sides really locking horns. >>> new light is being shed on the problem of american kids and obesity. and two harvard doctors are weighing in. >> what they're saying about overweight children has just about everybody taking sides on this. abc's lana zach explains the controversy. >> reporter: thanks, peggy and daniel. it's really a radical idea and it's intended to get people talking about childhood obesity. in "the journal of the american medical association," two highly respected experts in the field are weighing in with this provocative question. should extremely